Do rats feel joy? It can be hard to tell, since they can’t exactly greet us with a grin. But now, for the first time, scientists have spotted the rat equivalent of a smile—and it’s all in the ears.

“While this study doesn’t have direct clinical impact, it supports previous observations that psychostimulants affect brain function in children with ADHD not only when they’re faced with cognitive ...

Did you catch that guy’s smile? Probably. We are able to accurately recognize a smile in about 50 milliseconds (that’s a fleeting 1/20 of a second). Not only that, we can recognize a happy expression ...

Autistic and non-autistic people express emotions differently through their facial movements, according to a new study, which may help to explain why emotional expressions are sometimes misinterpreted ...